I don’t really own too many skins, but I’m just listing a few that look good. (Wish I had some of the Elite and all of the Voodoo skins. .3.)
Goliath - Savage, Elite and Voodoo
Kraken - Default and Voodoo.
Wraith - Magma, Voodoo, Bog and Clownfish.
Behemoth - Default, Sandstone, and Elite.
Gorgon - Elite, Scarab and Scarlet.

Honestly, the devs should add some community made skins and possibly hold a vote for like… 5 skins per Monster or something (Blue Ring Octopus skin for Kraken pls ;—; ). I’ve seen a lot of neat fan skins, like in this thread